59 lines
1.7 KiB
Java
59 lines
1.7 KiB
Java
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.os;
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import android.util.Log;
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import java.time.Clock;
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import java.time.DateTimeException;
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import java.time.ZoneId;
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import java.util.Arrays;
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/**
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* Single {@link Clock} that will return the best available time from a set of
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* prioritized {@link Clock} instances.
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* <p>
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* For example, when {@link SystemClock#currentNetworkTimeClock()} isn't able to
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* provide the time, this class could use {@link Clock#systemUTC()} instead.
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*
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* @hide
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*/
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public class BestClock extends SimpleClock {
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private static final String TAG = "BestClock";
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private final Clock[] clocks;
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public BestClock(ZoneId zone, Clock... clocks) {
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super(zone);
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this.clocks = clocks;
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}
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@Override
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public long millis() {
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for (Clock clock : clocks) {
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try {
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return clock.millis();
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} catch (DateTimeException e) {
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// Ignore and attempt the next clock
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Log.w(TAG, e.toString());
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}
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}
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throw new DateTimeException(
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"No clocks in " + Arrays.toString(clocks) + " were able to provide time");
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}
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}
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